Two examples to show Hα profile asymmetries. The left panel corresponds to “LAMOST J043439.28+250101.0”, which has a LAMOST obsid = 634715116. The right panel corresponds to “LAMOST J043033.97+144452.7”, which has a LAMOST obsid = 763510066. The red and green dashed line represents the integration boundary, the pink and blue dashed lines represent the theoretical and actual peak positions of the Hα profile, respectively, and the bright blue and yellow line represents the integration area. The yellow dashed line is a double-Gaussian fitting result as a reference.